修复文件上传时文件名读取错误的问题

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yizhi-multipart-reader",
-  "version": "1.0.3",
+  "version": "1.0.4",
   "description": "",
   "main": "dist/index.js",
   "types": "typing/index.d.ts",

src/reader.ts

@@ -284,8 +284,9 @@ export class MultipartReader {
 			if (key == 'content-disposition') {
 				const items = val.split(/;/).map(s => s.trim()).filter(s => !!s)
 				items.forEach(item => {
-					let [k, v] = item.split(/=/)
-					if (!v) return
+					const matchItem = item.match(/^([\s\S]+?)=([\s\S]+?)$/)
+					if (!matchItem) return
+					let [k, v] = matchItem.map(s => s.trim())
 					k = k.toLowerCase()
 					//去除引号
 					if (v[0] == '"' && v[v.length - 1] == '"') v = v.substring(1, v.length - 1)